cache: add cache debug plaintext for image manifest and http

[tonistiigi]

These two cases were missing.

[crazy-max]

https://explore.ggcr.dev/?image=crazymax%2Ftest%3Abuildkit-6076

FROM alpine
COPY --link --from=docker/buildx-bin /buildx /usr/bin/buildx
RUN buildx version

Debugging remote cache config with #6076 I get:

ID: 1
Digest: sha256:ec26cd799826d9885682a5502f99766b244849b19296d63b87d98572677c78e3
Children:
  Input 0:	 2
Plaintexts:
sha256:ec26cd799826d9885682a5502f99766b244849b19296d63b87d98572677c78e3 (string):
  sha256:f389a15b0192e0db58e05ed42287a61d8f77e21841256be23e0e8f2939652f16 (string):
  data: sha256:f389a15b0192e0db58e05ed42287a61d8f77e21841256be23e0e8f2939652f16@0

sha256:f389a15b0192e0db58e05ed42287a61d8f77e21841256be23e0e8f2939652f16 (string):
  data: buildkit.source.v0:sha256:7eaa7e5de62b70adb0d0c875f6a90ddd20b18fe9f215c3a9172f1011fffb7cc4


ID: 2
Parents:
  Input 0:	1	sha256:211ba7df2b1034446c53e8b3509784f826bf6f146e472e4dc5893bb0c6af2f0f
    Selector: sha256:2d1ed546f6ffdbe227aeec6641669ca0b942cb61a097da529ff6b4c08523041f
  Input 0:	7	sha256:211ba7df2b1034446c53e8b3509784f826bf6f146e472e4dc5893bb0c6af2f0f
  Input 0:	8	sha256:211ba7df2b1034446c53e8b3509784f826bf6f146e472e4dc5893bb0c6af2f0f
    Selector: sha256:2d1ed546f6ffdbe227aeec6641669ca0b942cb61a097da529ff6b4c08523041f
Children:
  Input 0:	 3
Plaintexts:
sha256:2d1ed546f6ffdbe227aeec6641669ca0b942cb61a097da529ff6b4c08523041f (string-list):
  data: /buildx

sha256:211ba7df2b1034446c53e8b3509784f826bf6f146e472e4dc5893bb0c6af2f0f (string):
  sha256:1d13e80d73905817379fa0792f31554423311d27101678c993fe119cf81d9600 (json):
  data: sha256:1d13e80d73905817379fa0792f31554423311d27101678c993fe119cf81d9600@0

sha256:1d13e80d73905817379fa0792f31554423311d27101678c993fe119cf81d9600 (json):
  data: {"Type":"buildkit.file.v0","Actions":["eyJzcmMiOiJidWlsZHgiLCJkZXN0IjoiL3Vzci9iaW4vYnVpbGR4IiwibW9kZSI6LTEsImZvbGxvd1N5bWxpbmsiOnRydWUsImRpckNvcHlDb250ZW50cyI6dHJ1ZSwiY3JlYXRlRGVzdFBhdGgiOnRydWUsImFsbG93V2lsZGNhcmQiOnRydWUsImFsbG93RW1wdHlXaWxkY2FyZCI6dHJ1ZSwidGltZXN0YW1wIjotMX0="],"indexes":[[-1,0,0]]}


ID: 3
Parents:
  Input 0:	5	sha256:5dbfbafede47210a7bd7363461bc885ec7310febe761daffdf666bfdae5970ff
  Input 0:	6	sha256:5dbfbafede47210a7bd7363461bc885ec7310febe761daffdf666bfdae5970ff
  Input 1:	2	sha256:5dbfbafede47210a7bd7363461bc885ec7310febe761daffdf666bfdae5970ff
Children:
  Input 0:	 4
Plaintexts:
sha256:5dbfbafede47210a7bd7363461bc885ec7310febe761daffdf666bfdae5970ff (string):
  sha256:436287a2dc2ce494f564331be9ea3a9f27ebec398567877043da2f618f33d6c8 (json):
  data: sha256:436287a2dc2ce494f564331be9ea3a9f27ebec398567877043da2f618f33d6c8@0

sha256:436287a2dc2ce494f564331be9ea3a9f27ebec398567877043da2f618f33d6c8 (json):
  data: {"Type":"buildkit.merge.v0","Merge":{"inputs":[{},{"input":1}]}}


ID: 4
Parents:
  Input 0:	3	sha256:7615c27163f32303896f189f4020fcf67fee678f7cff44cd39f2383992d779aa
    Selector: sha256:8a5edab282632443219e051e4ade2d1d5bbc671c781051bf1437897cbdfea0f1
Plaintexts:
sha256:8a5edab282632443219e051e4ade2d1d5bbc671c781051bf1437897cbdfea0f1 (string):
  data: /

sha256:7615c27163f32303896f189f4020fcf67fee678f7cff44cd39f2383992d779aa (string):
  sha256:be1333e0c3f0b35e50f95fb628a65dccda19905c4a018c1bcb461b8b71b98673 (json):
  data: sha256:be1333e0c3f0b35e50f95fb628a65dccda19905c4a018c1bcb461b8b71b98673@0

sha256:be1333e0c3f0b35e50f95fb628a65dccda19905c4a018c1bcb461b8b71b98673 (json):
  data: {"Type":"buildkit.exec.v0","Exec":{"meta":{"args":["/bin/sh","-c","buildx version"],"env":["PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"],"cwd":"/","removeMountStubsRecursive":true}},"OS":"linux","Arch":"amd64"}


ID: 5
Digest: sha256:8e06a68b6fc81bc311289cc094a7c7162061e58d2dbc0f6baa8df5f7e14443c5
Children:
  Input 0:	 3
Plaintexts:
sha256:8e06a68b6fc81bc311289cc094a7c7162061e58d2dbc0f6baa8df5f7e14443c5 (string):
  sha256:a8c45412a3163e7c61cb2dd6e42376c41ec924543f7eec0899cb494b3d7f5e71 (string):
  data: sha256:a8c45412a3163e7c61cb2dd6e42376c41ec924543f7eec0899cb494b3d7f5e71@0

sha256:a8c45412a3163e7c61cb2dd6e42376c41ec924543f7eec0899cb494b3d7f5e71 (string):
  sha256:95d4982c89fd6816afdab744a3b6513c9072f870a434e95f325ba0aa1c77c47f (json):
  data: buildkit.source.v0:sha256:95d4982c89fd6816afdab744a3b6513c9072f870a434e95f325ba0aa1c77c47f

sha256:95d4982c89fd6816afdab744a3b6513c9072f870a434e95f325ba0aa1c77c47f (json):
  data: {"Digest":"sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1","OS":"linux","Arch":"amd64"}


ID: 6
Digest: sha256:89613c014914fc647717af0c3feecb02af98ec64275ff68909a59c3c8e35fd0f
Children:
  Input 0:	 3
Plaintexts:
sha256:89613c014914fc647717af0c3feecb02af98ec64275ff68909a59c3c8e35fd0f (string):
  sha256:8c72bc153f13bdf1c78dd16a56bad285b50014c3d58b61ae296de88d5397eebe (string):
  data: sha256:8c72bc153f13bdf1c78dd16a56bad285b50014c3d58b61ae296de88d5397eebe@0

sha256:8c72bc153f13bdf1c78dd16a56bad285b50014c3d58b61ae296de88d5397eebe (string):
  data: buildkit.source.v0:sha256:418dccb7d85a63a6aa574439840f7a6fa6fd2321b3e2394568a317735e867d35


ID: 7
Digest: sha256:4b2fbb9f1a227f95cb581ee04602da704ac33ad5fee7add758d76980b5f8a8bf
Children:
  Input 0:	 2
Plaintexts:
sha256:4b2fbb9f1a227f95cb581ee04602da704ac33ad5fee7add758d76980b5f8a8bf (string):
  sha256:2a4206988f44d080e90f37d88a646833d41c28a69022a7ab7e09f6818e9bb470 (digest-list):
  data: sha256:2a4206988f44d080e90f37d88a646833d41c28a69022a7ab7e09f6818e9bb470@-1

sha256:2a4206988f44d080e90f37d88a646833d41c28a69022a7ab7e09f6818e9bb470 (digest-list):
  sha256:5986dd490cc1f3f1840ade39c6ea7c44bc53df498d0d79d816561420690f4286 (file):
  data: sha256:5986dd490cc1f3f1840ade39c6ea7c44bc53df498d0d79d816561420690f4286

sha256:5986dd490cc1f3f1840ade39c6ea7c44bc53df498d0d79d816561420690f4286 (file):
  data: name
  data: mode493
  data: uid0
  data: gid0
  data: size67735736
  data: typeflag0
  data: linkname
  data: uname
  data: gname
  data: devmajor0
  data: devminor0
  skipping 67735736 bytes


ID: 8
Digest: sha256:88a1307eee64e5bb0ed9c3c86dfc3e9e27f5f5850fa41176155dd20383c03b35
Children:
  Input 0:	 2
Plaintexts:
sha256:88a1307eee64e5bb0ed9c3c86dfc3e9e27f5f5850fa41176155dd20383c03b35 (string):
  sha256:83615151ea54a5b028b33ac183f2338b6c9a01deffc00b01f236970c1a1d40be (string):
  data: sha256:83615151ea54a5b028b33ac183f2338b6c9a01deffc00b01f236970c1a1d40be@0

sha256:83615151ea54a5b028b33ac183f2338b6c9a01deffc00b01f236970c1a1d40be (string):
  sha256:16b34666a797c965504bc9f94907408296935594cd155c846c239b12c6d07585 (json):
  data: buildkit.source.v0:sha256:16b34666a797c965504bc9f94907408296935594cd155c846c239b12c6d07585

sha256:16b34666a797c965504bc9f94907408296935594cd155c846c239b12c6d07585 (json):
  data: {"Digest":"sha256:8eac7ff91fa02f72305d034243e6f76c8b54a021a95f667463fbb87fe39968bd","OS":"linux","Arch":"amd64"}